Function enumerate 

pub fn enumerate<A: Into<Args>>(args: A) -> Result<Vec<Args>, Error>

Enumerate a list of available devices on the system.

args: a set of arguments to filter the devices returned.

Example (list all devices)

for dev in soapysdr::enumerate("").unwrap() {
    println!("{}", dev);
}

This function returns a list of argument lists that can be passed to Device::new() to open the device.